Chemiluminescent and fluorescent substrate pads and uses thereof

1. A composition comprising:

a) an absorbent pad comprising (a) a fibrous material and (b) a liquid formulation which comprises a chemiluminescent substrate; wherein the pad: (i) has a thickness from 0.2 mm to 3 mm; (ii) has an extrinsic absorbency from 150 mL/m 2 to 500 mL/m 2 ; and (iii) is impregnated with the liquid formulation, wherein the fibrous material comprises a polyester/cellulose polymer blend, a hydroentangled polyester/cellulose blend, nylon, or a polyamide, and

b) a blot membrane in fluid contact with the absorbent pad, wherein the blot membrane comprises a biomolecule analyte bound to a detection agent, wherein the detection agent is reactive with the chemiluminescent substrate on the pad.

2. The composition of claim 1 , wherein the detection agent comprises an enzyme reactive with the chemiluminescent substrate.

3. The composition of claim 1 , wherein the absorbent pad has a basis weight from 25 g/m 2 to 100 g/m 2 .

4. The composition of claim 3 , wherein the absorbent pad has a basis weight from 50 g/m 2 to 70 g/m 2 .

5. The composition of claim 1 , wherein the absorbent pad has: (i) the thickness of the pad is from 0.2 mm to 1 mm; and (ii) the extrinsic absorbency of the pad is from 250 mL/m 2 to 400 mL/m 2 .

6. The composition of claim 5 , wherein the thickness of the pad is from 0.3 mm to 0.7 mm.

7. The composition of claim 1 , wherein the polyester/cellulose polymer blend comprises 40 wt % to 50 wt % polyester and 50 wt % to 60 wt % cellulose.

8. The composition of claim 1 , wherein the polyester/cellulose polymer blend comprises 45 wt % polyester and 55 wt % cellulose.

9. The composition of claim 1 , wherein the chemiluminescent substrate is a substrate for horseradish peroxidase, alkaline phosphatase, β-galactosidase, β-glucosidase, β-glucuronidase, arylesterase, sulfatase, or a combination of one or more thereof.

10. The composition of claim 1 , wherein the liquid formulation further comprises an oxidizing agent, a buffer, a stabilizing agent, an enhancer, or a combination of one or more thereof.

11. The composition of claim 10 , wherein the oxidizing agent is a peroxide compound, a compound that produces a peroxide in situ, hydrogen peroxide, urea hydrogen peroxide, sodium carbonate hydrogen peroxide, a perborate salt, or a combination of one or more thereof.

12. The composition of claim 10 , wherein the stabilizing agent is cyclodextrin, dextrin, a sulfate, a sugar, a nonionic surfactant, an anionic surfactant, an ethylene oxide/propylene oxide adduct, polyoxyethylenesorbitan monolaurate, polyoxyethylenesorbitan monopalmitate, polyethylene glycol sorbitan monostearate, polyethylene glycol sorbitan monooleate, polyoxyethylenesorbitan trioleate, t-octylphenoxypolyethoxyethanol, polyethylene glycol nonylphenyl ether, polyethylene glycol tert-octylphenyl ether, polyethylene glycol tert-octylphenyl ether, polyethylene glycol dodecyl ether, or a combination of one or more thereof.

13. The composition of claim 10 , wherein the buffer is ethylenediamine tetraacetic acid, succinate, citrate, aspartic acid, glutamic acid, maleate, cacodylate, 2-(N-morpholino)-ethanesulfonic acid, N-(2-acetamido)-2-aminoethanesulfonic acid, piperazine-N,N′-2-ethanesulfonic acid, 2-(N-morpholino)-2-hydroxy-propanesulfonic acid, N,N-bis-(hydroxyethyl)-2-aminoethanesulfonic acid, 3-(N-morpholino)-propanesulfonic acid, N-2-hydroxyethyl-piperazine-N-2-ethanesulfonic acid, 3-(N-tris-(hydroxymethyl)methylamino)-2-hydroxypropanesulfonic acid, 3-(N,N-bis[2-hydroxyethyl]amino)-2-hydroxypropanesulfonic acid, N-(2-hydroxyethyl)piperazine-N′-(2-hydroxypropanesulfonic acid), 4-(2-hydroxyethyl)-1-piperazine propanesulfonic acid, N-[tris(hydroxymethyl)-methyl]glycine, N,N-bis(2-hydroxyethyl)glycine, (2-hydroxy-1,1-bis(hydroxymethyl)ethyl)amino]-1-propanesulfonic acid, N-(1,1-dimethyl-2-hydroxyethyl)-3-amino-2-hydroxypropanesulfonic acid, tris(hydroxy methyl)amino-methane, and bis[2-hydroxyethyl]iminotris-[hydroxymethyl]methane, or a combination of one or more thereof.

14. The composition of claim 10 , wherein the enhancer is a halogenated phenol; an alkylated phenol; 4-benzylphenol; 4-(2′,4′-dinitrostyryl) phenol; 2,4-dichlorophenol; p-hydroxycinnamic acid; p-fluorocinnamic acid; p-nitroicinnamic acid; p-aminocinnamic acid; m-hydroxycinnamic acid; o-hydroxycinnamic acid; 4-phenoxyphenol; 4-(4-hydroxyphenoxy) phenol; p-phenylphenol; 2-chloro-4-phenylphenol; 4′-(4′-hydroxyphenyl) benzophenone; 4-(phenylazo) phenol; 4-(2′-carboxyphenylaza) phenol; 1,6-dibromonaphtho-2-ol; 1-bromonaphtho-2-ol; 2-naphthol; 6-bromonaphth-2-ol; 6-hydroxybenzothiazole; 2-amino-6-hydroxybenzothiazole; 2,6-dihydroxybenzothiazole; 2-cyano-6-hydroxybenzothiazole; dehydroluciferin; firefly luciferin; phenolindophenol; 2,6-dichlorophenolindophenol; 2,6-dichlorophenol-o-cresol; phenolindoaniline; a substituted or unsubstituted N-alkylphenoxazine; a substituted or unsubstituted N-alkylphenothiazine; a substituted or unsubstituted N-alkylpyrimidylphenoxazine; N-alkylpyridylphenoxazine; a substituted or unsubstituted 2-hydroxy-9-fluorenone; a substituted or unsubstituted 6-hydroxybenzoxazole, or a combination of one or more thereof.

15. The composition of claim 1 , wherein the chemiluminescent substrate is luminol, isoluminol, acridane, phenyl-10-methylacridane-9-carboxylate, 2,4,6-trichiorophenyl-10-methylacndane-9-carboxylate, pyrogallol, phloroglucinol, resorcinol, or a combination thereof.

16. A device system comprising: 1) a composition of claim 1 ; and 2) an imaging device.

17. A method for detecting a biomolecule analyte in a biological sample comprising:

(a) separating biomolecular components of a biological sample using gel electrophoresis thereby forming a separation gel comprising separated biomolecular components, wherein the separated biomolecular components comprise a biomolecule analyte;

(b) transferring the separated biomolecular components to a blot membrane;

(c) contacting the blot membrane with a detection agent and allowing the detection agent to bind to the biological analyte, wherein the detection agent is reactive with a luminescent substrate;

(d) contacting the blot membrane with an absorbent pad to provide the composition of claim 1 , wherein the luminescent substrate reacts with the detection agent thereby forming a luminescent signal; and

(e) detecting the luminescent signal thereby detecting the biomolecule analyte.